novatech mud pump free sample

Manufacturer of valves and valve seats. The company offers well service valves, pistons, mud pump valves and seats and drilling products. It offers its services to military/defense and commercial industries.

Design innovation has been the driving force for Weir Novatech and its rigid full open valve and seat. Novatech offers valves and seats for all major well service and mud pump applications including work-over, cementing, acidizing, fracturing and drilling. Weir Novatech valves and seats are manufactured by combining the advantages of forged steel to assure impact strength and precision casting to maximize flow and minimize fluid turbulence. All Weir Novatech valves and seats are manufactured to rigid quality control standards. Weir Novatech is the leader in full open valve and seat technology, providing the first drilling valve and seat in the industry rated for continuous service at 7500 PSI. Available in API 4, 5, 6, 7 and 8 sizes, plus seats for all OEM tapers. Weir Novatech manufacturers the strongest and most reliable valve and seat in the industry.

Novatech is now part of Weir Oil & Gas a leader in the design, manufacture and service of pumps and ancillary equipment for upstream and downstream markets. Weir Novatech is an industry leader in full open valve and seat technology and manufactures a wide variety of valves and seats for workover pumps, high pressure well service fracturing pumps, cementing pumps and mud pumps.

A valve suitable for abrasive fluids such as oil field drilling mud comprises a valve body and a corresponding valve seat, with certain valve bodies incorporating an elastomeric seal within a peripheral seal retention groove. Such a valve is usually mounted in the fluid end of a pump incorporating positive displacement pistons or plungers in multiple cylinders. Such valves may be stem-guided full-open designs (i.e., having a top guide stem and a bottom crow-foot guide on the valve body) or web-seat, stem-guided designs (i.e., having top and bottom guide stems on the valve body). Note that stem-guided full-open designs are also commonly known as full-open seat wing-guided designs; the former term will be used herein for convenience. However named, the above valves are expensive to manufacture, especially the moving portion or valve body. Besides requiring finish machining to close tolerances for adequate sealing, such valve bodies must be made strong enough to resist significant distortion under load with resultant leaks and fatigue failures. Prior efforts to reduce distortion under load by strengthening such valve bodies have generally resulted in higher cost and/or heavier designs which exacerbate sealing problems and/or increase the stress of impact loading on components of the valve assembly.

Commercially important design improvements necessarily reflect the fact that certain mud pump valve body and seat dimensions are effectively limited by industry practices and American Petroleum Institute (API) Standards. For example, the web-seat, stem-guided designs favored for mud pump valves are commonly made compatible with the industry benchmark widely known as the TRW Mission 4-web seat, which determines many valve dimensions. Further, API Standards determine the envelope into which valve bodies and seats must fit to promote interchangeability in the field.

Another important disadvantage of the Channel-Beam design, as noted above, relates to seating of the seal insert. Channel-Beam valve bodies generally incorporate an elastomeric seal insert that snaps into its peripheral seal retention groove. A typical “snap-on” seal insert comprises a portion of a toroidal structure such as a plastic or rubber ring that is sized to fit tightly, and thus sealingly, in the peripheral seal retention groove. When properly fitted, the elastomeric seal mates tightly with a corresponding valve seat even though the valve body is slightly distorted and even if small particles carried by the pumped fluid may be trapped between sealing surfaces. Practical advantages of such a seal insert include extended valve life and improved valve performance, but proper fitting and sealing of the elastomeric ring on a valve body is often difficult in the field.

The space within the valve body and seal assembly may communicate with space outside the valve body and seal assembly via the above-described longitudinal fluid passage, and the space within the valve body and seal assembly may be substantially occupied by a flowable substance that is substantially incompressible. Note that a substantially incompressible flowable substance that fills the space within a valve body of the present invention will hydraulically transmit to all surfaces enclosing the space any pressure outside the valve body that is applied to the flowable substance via the longitudinal fluid passage. This facilitates equalization of large differential pressures that would otherwise tend to compress a valve body having a totally sealed interior hollow. High pressure outside the valve body during a pump pressure stroke is substantially balanced by pressure within the valve body, the internal pressure having been hydraulically transmitted via the longitudinal fluid passage to flowable substance that substantially fills the space inside the valve body.

Flowable substances suitable for hydraulically transmitting equalizing pressures within valve bodies include, for example, liquids, gels and/or elastomers which tend to flow under high pressure (e.g., certain urethanes). Because the flowable substances are substantially incompressible, such hydraulic pressure transmission to valve body interior surfaces can occur with very little mass movement of the substances themselves. Hence mixing of pumped fluids (e.g., drilling mud) with flowable substances in the longitudinal fluid passage can be minimized by the use of one or more longitudinally movable plugs in the longitudinal fluid passage and/or by the use of relatively high-viscosity flowable substances.

A hollow or interior space thus formed by joining of the first and second portions to make a valve body may be totally enclosed (i.e., not in fluid communication with space outside the valve body). Alternatively, the hollow or space may be substantially enclosed by the valve body but in fluid communication with space outside the valve body through a fluid passage in the valve body. The presence or absence of such a fluid passage affects pressure equalization across the valve body as well as the structure of the finished valve, particularly during carburization. When desired, such a passage may be formed, for example, by investment casting the passage or by drilling longitudinally in the top guide stem. If the interior space is filled with flowable substance as described herein, this fluid passage may be sealed with a longitudinally movable plug of a relatively light-weight material (e.g., a cast-in-place polymer insert) so as to prevent passage of pumped fluid into the interior space when the valve body is put into service.

Regarding differential pressure across a valve body, the presence of a longitudinal fluid passage analogous to fluid passage 14 allows substantial equalization of fluid pressures within and external to a valve body. Absent such a longitudinal fluid passage, pressure external to a valve body during a pump pressure stroke would typically greatly exceed pressure within the valve body, tending to crush the valve body. The presence of a longitudinal fluid passage reduces or eliminates this periodic crushing tendency, thus maintaining valve body strength by minimizing a cyclic stress associated with metal fatigue.

Patented June 26, 1934 UNITED STATES PATENT OFFICE 7 1,964,249 PUMPIVALVE Harry M. Chase, Quincy,,Ill., assignor to Gardner- Denver Company, Quincy, 111., a corporation of Delaware I Application November 13, 1930, Serial No. 495,380

3 Claims. (01. 251-144) My invention relates to improvements in pump Slidable vertically of the stem 13 is a valve havvalves, particularly to that type of valve designed ing the head 10, the under face of which is conefor use in mud pumps. However, it will be shaped, in cross section, so asto seat upon the obvious that my invention is not confined to this concaved face 9 of the seat. The valve carries 5 particular use. a tubular extension 17 completely enclosing the The object of my invention is to providea pump upper end of the stem 13. Positioned upon the valve wherein the usual clattering of the parts head 10, and over the tubular extension 17, is a during its operation is prevented. flexible packing element 18, the outer edge of Another object of the invention is to provide a which extends beyond the head 10 and forms a 10 pump valve having a packing element which preseal preventing the passage of fluid between the vents, when acted upon by pressure fluid, the seat9 and head 10. leakage of fluid between the valve and its seat. In order to hold the packing element in place The packing, furthermore, serving as the means upon the head 10 there is provided a follower or for placing the several parts of the valve under retaining plate 19, slidable upon the extension 17.

15 tension so as to eliminate movement of one part The under face of the plate 19 carries a conewith respect to the other. shaped boss 20 which, when the plate is in place, The preferred form of the construction is shown tends to compress the packing element therein the accompanying drawings, in which: under, making a semi-rigid structure, including Figure 1 is a vertical sectional view through a the head, packing element and follower. 20 portion of a pump casing, showing therein the To look the follower 19 in place upon the stem, improved valve. and at the same time serving to press the boss 20 Figure 2 is a sectional view on the line 2-2 of of the plate 19 into the packing element, there is Figure l. provided an annular groove 21 around the exten- Figure 3 is a perspective view showing the sion 17 which receives therein a horseshoe locking 25 upper face of the follower plate. element 22. The free ends of this locking element Figure 4 is a similar view showing the under 22 are tapered so that it may be readily inserted face of the plate. within the groove and when forced in place depress Figure 5 is a perspective view of the locking the follower 19. element. The upper face of the follower 19 has an up- 30 Referring to the accompanying drawings in dewardly extending projection 23 which, upon the tail, the numeral 1 designates the inner wall of insertion of the locking element 22in its place, a pump casing, the valve adapted toform a paslies between the legs of the element. sage from the interior of the pump chamber to a To maintain the valve to its seat there is the chamber 2. Anopening is formedinthe chamber usual coiled spring 24, the upper end bearing 35 2 above the valve and closed by a suitable cap 3 against the under face of the cap 3, while its bolted to the pump wall in any suitable manner, lower end engages the upper face of the follower for example, by stud bolts 4. 19 and encloses both the locking element 22 and The wall 1 of the pump casing is provided with the upstanding boss 23. The spring thus being a tapered opening 5 which receives therein an held in a relatively fixed position with respect 40 annular valve seat 6. to the follower 19, and at the same time pre- The valve seat 6 is in the form of a plate having venting the withdrawal of the locking element 22 a plurality of openings 7 which surround a central from the groove 21. opening 8. The upper face of the valve seat 6 is Briefly, in operation, the valve is moved to concaved, as indicated at 9, for the reception and from its seat 9 either under the influence 45 thereupon ofavalve head 10. of tension exerted by the holding spring 24,

The central opening 8 is enlarged in its upper or by the fluid compressed in the pump. portion, as indicated at 11, to form a suitable Heretofore, in valves of this type, it has been shoulder 12. Positioned vertically within the found that when the packing element wears to. opening 8 is a valve stem 13, the lower end of some degree the parts become free to move with 50 which is reduced as at 14 to form a shoulder 15, respect to each other, thus creating an undesirawhich abuts against the shoulder 12 formed in the ble noise, and at the same time reducing very plate. The extreme lower"end of the stem 13 is materially the life of the valve and the packing threaded to receive thereon a suitable nut 16, element. The present-invention overcomes this locking the stem in place and against the defect, in that applicant has provided a valve 55 shoulder 12. wherein the parts are held in a relatively rigid position but under pressure exerted by the resiliency of the packing element.

1. In a pump valve, the combination of a seat and a valve having a stem, a packing element, a retaining plate for the packing element on the stem, a plate engaging spring surrounding the stem in spaced relation thereto, an upstanding projection on the plate, a locking and spacing key engageable with the stem and plate and disposed in the same plane as the projection, and said key and projection each having its entire outer surface snugly engaged by the portion of the spring that contacts with the plate to lock the key and to hold said spring in spaced relation to the stem.

2. In a pump valve, the combination of a seat and a valve having a stem, a packing element, a retaining plate for the packing element on the stem, a plate engaging spring surrounding the stem in spaced relation thereto, and a flat horseshoe shaped key engageable with the stem at the inner edge of said key and having its entire outer surface snugly engaged by the portion of the spring in contact with the plate.

3. In a pump valve, the combination of a seat and a valve having a stem, a packing element, a retaining plate for the packing element on the stem, a plate engaging spring surrounding the stem in spaced relation thereto, a flat horse-shoe shaped key engageable with the stem and plate, an upstanding projection on the plate positioned between the ends of said key, and the exterior surface of said key and projection forming a substantially continuous flange snugly engageable by the portion of the spring in contact with the plate.